Malicious PDF — malware analysis report

Static analysis result for SHA-256 b74b33edbff0dcfe…

MALICIOUS

PDF

92.3 KB Created: 2021-08-02 18:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a16fcd91846d5823942634ba00c7f6d3 SHA-1: a4449e4c239b2f802dfeddcddd2de46e868b79a5 SHA-256: b74b33edbff0dcfe23f36495a12e5b8a65a6561fb8f833c81becc8615baf6a71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely serves as a phishing or trojan delivery mechanism. The document contains a link farm pointing to numerous URLs, many hosted on compromised CMS platforms and disposable domains, suggesting an attempt to obscure the ultimate destination or to leverage compromised infrastructure for distribution. The presence of multiple external URIs and the ML classification strongly suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/d16edfdfa7f85c3e768ca9c8e16414b7/mizezaruv.pdf In PDF document text
    • http://sushikyototogo.com/uploads/files/96133576206.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b2338a232---dufodawakosafuku.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/2ikp0ua9r1q2tik4s16v2fvh4q/vamitapadimarilil.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/tafumezukebutibix.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/14623980189.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/d35d0c66bb3d2163daf547e19846adb4/jumatowatomirone.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760832d1c9b---xogawipifinopigitenuro.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/mepanaraturogoxixeziduw.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/500b77b4d43c029ec65040d5c42d036f/mopavesizet.pdfIn PDF document text
    • https://moscreen.in/cmsfiles/file/bizinuwezopebomaf.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/ae19583ccac2470492d6001e8ff5bbc4/14742477350.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16076029f0cf17---79443829638.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160948e2ac6cbf---51570170510.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/jhqfm9ion533omnllga91b42i2/5840436888.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160861d7aab5e0---jaxomuza.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8a5d4b2eb5e19bceb773d9873d6b15b8/40960878868.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607acab859dce---lijupixeka.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/winugevivomupanazokowujur.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f1b6e366b84---20082400776.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/2dc85c082c47cd9ecae0c766eb158386/50958155579.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=cuales+son+las+enfermedades+mas+frecuentes+del+sistema+endocrinoPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001024d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024D 17516 bytes
SHA-256: fc05f7724b88da0753bedc83d0f60e88e28e61eda08657d9dcbd0811bdd2db86
font_01_sfnt_off00012ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14708 10768 bytes
SHA-256: 32cfe34d2646022f8bd3816e6aa8856127f89fd30cf38b7cbd750bd64b253219

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